#define _GNU_SOURCE
#include <stdlib.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <unistd.h>

int main(int argc, char ** argv) {
	int s = socket(AF_INET, SOCK_STREAM | SOCK_CLOEXEC, 0);
	struct sockaddr_in addr = {
		.sin_family = AF_INET,
		.sin_port = 12345,
		.sin_addr = 0,
	};
	if(bind(s, &addr, sizeof(addr)) == -1 || listen(s, 128))
		abort();

	int fd = accept4(s, NULL, NULL, SOCK_CLOEXEC);
	if(fd == -1)
		abort();
	dup2(fd, 0);
	execvp(argv[1], argv + 1);
}